// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once
#include <pollux/exec/operator.h>

namespace kumo::pollux::exec {
    class Limit : public Operator {
    public:
        Limit(
            int32_t operatorId,
            DriverCtx *driverCtx,
            const std::shared_ptr<const core::LimitNode> &limitNode);

        bool needsInput() const override;

        void addInput(RowVectorPtr input) override;

        RowVectorPtr getOutput() override;

        BlockingReason isBlocked(ContinueFuture * /*future*/) override {
            return BlockingReason::kNotBlocked;
        }

        bool isFinished() override {
            return finished_ || (noMoreInput_ && input_ == nullptr);
        }

    private:
        int64_t remainingOffset_;
        int64_t remainingLimit_;
        bool finished_{false};
    };
} // namespace kumo::pollux::exec
